The Sierra Designs Women's Mobile Mummy 600 3 Season Sleeping Bag is a multi season sleeping bag for the movers and the shakers that love to stay warm. The advantage of this bag is the movement, as you can get away with wearing it from the moment your tent is set up, to just before you're heading back out on the trail. The 30D polyester ripstop outer fabric is durable and protective of the 600 fill duck DriDown Insulation on the inside. DriDown has been coated, providing moisture resistance during your hiking adventure that stays drier than untreated down. The EN Comfort Limit of 25degF keeps you toasty, while your arms and feet Are free to move in and out of the cabin I mean sleeping bag as you please. That's right, self sealing arm and foot vents make it ready to not just cool off but read a book, walk around camp, or make dinner. The zipper is front and center for simple entry. All you have to do is decide if you're sleeping on your side, back or front, don't worry, the bag will follow. Features of the Sierra Designs Women's Mobile Mummy 600 3 Season Sleeping Bag Draft Prevention Stowable footbox Ultralight jacket hood with no cords or toggles Zipperless armports Garments style shoulder design Centrally placed, ventable zipper